SOLVED:Pulverized coal particles are used in oxy-fuel combustion power plants for electricity generation. Consider a situation where coal particles are suspended in hot air flowing through a heated tube, where the convection heat transfer coefficient is 100  W / m^2,  K. If the average surface area and volume of the coal particles are 3.1  mm^2 and 0.5  mm^3, respectively, determine how much time it would take to heat the coal particles to two-thirds of the initial temperature difference.

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SOLVED: Oxy-fuel combustion power plants use pulverized coal particles as fuel to burn in a pure oxygen environment to generate electricity. Before entering the furnace, pulverized spherical coal particles with an average diameter of 300 μm are transported at 2  m / s through a 3-m-long heated tube while suspended in hot air. The air temperature in the tube is 900^∘ C, and the average convection heat transfer coefficient is 250 W / m^2 ·K. Determine the temperature of the coal particles at the e

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